new chemical: silver nitrate in water

Hi Alex --
Could you provide the MSDS for the formulation you plan to use? I take
that you will be using a pre-mix formulation? (We don't allow mixing of
powders in the cleanroom -- it you want to mix, you would have to do it
outside the lab -- we do have some limited bench space for this, for
we'd ask for your procedures.) If you are using a fairly dilute silver
nitrate, it would certainly make us happier (in addition to you
providing your own labware.)
One suggestion: I would suspect that pyrex or quartz lab ware might not
work for this because it would tie up a lot of your HF (or you'd have to
change your solution to accomodate.) I would suspect that teflon or
other plastic labware might not be ideal because it doesn't conduct heat
very well, so you might have a hard time controlling temperature
(depending on whether your reaction generates or sucks up heat.) And if
you're running for an hour at 50C, you might have a lot of evaporation,
unless you put a teflon cover over your beaker.
Mary
Alex Guichard wrote:
> Hi Mary:
> Thanks for the quick response. Here is the MSDS. I was planning on
> using the ctb just to get the solution to 50C, I was not planning on
> incorporating the autoclave. I think they use the autoclave because
> in previous papers, they tried processing at temperatures above 100C
> (whereas in this paper the process T is 50C). Basically, I was just
> planning on processing with covered labware in the ctb, instead of
> doing it in an autoclave. If you would prefer, I can definitely
> supply my own labware. Let me know if you need any more information
> from me!
>> Thanks,
> Alex
>>>> Alex R. Guichard
> Ph.D Candidate
> Dept. of Mat. Sci. and Eng.
> Stanford University
> (m)919-434-6906 (h)650-968-1575
> (l)650-723-6352
>http://www.stanford.edu/group/brongersmagroup/>> On Jan 12, 2006, at 5:50 PM, Mary Tang wrote:
>>> Hi Alex --
>>>> Could you provide an MSDS for the solution you plan to use? It
>> would be helpful for our records if you have an electronic version,
>> as we are building our electronic database. Also, exactly how do
>> you plan to setup your system at this bench? I'm afraid I'm having
>> a little difficulty envisioning how this will be setup at the CTB.
>> And I'm curious as to why an autoclave was used (I wonder if it's
>> because temperature control of teflon labware is difficult or if
>> pressure was required to prevent evaporation, as you probably
>> couldn't use an ordinary reflux unit...) Do you end up with silver
>> onto everything? (If so, it would be nice if you could provide your
>> own labware.)
>>>> Thanks,
>>>> Mary
>>>> Alex Guichard wrote:
>>>>> Name: Alex Guichard
>>> Coral login: arguicha
>>> ph#: 3-6352
>>> PI: Mark Brongersma
>>> Chemical: Silver Nitrate (AgNO3), aqueous solution (less than 1M)
>>> Vendor: VWR, www.vwr.com
>>> Reason for request: Chemical fabrication of dense Si nanowire
>>> arrays (see attached .pdf paper)
>>> Process Flow: cleaning of virgin, uncontaminated prime wafers at
>>> wbdiff (AgNO3 will not be brought to wbdiff), chemical processing
>>> with AgNO3 (mixed with ~20ml of 49%HF) carried out at wbgeneral-
>>> ctb (for temperature control) for roughly 1 hour.
>>> Amount: ~ 200ml, liquid
>>> Storage: Chemical will not be stored at SNF
>>> Disposal: chemical will be disposed of into waste bottles and
>>> labelled with proper tag. Waste bottle will be put in waste area
>>> in chemical pass-through
>>>>>>>>> Please let me know if you need any additional information.
>>>>>> Sincerely,
>>> Alex
>>>>>>>>>>>> Alex R. Guichard
>>> Ph.D Candidate
>>> Dept. of Mat. Sci. and Eng.
>>> Stanford University
>>> (m)919-434-6906 (h)650-968-1575
>>> (l)650-723-6352
>>>http://www.stanford.edu/group/brongersmagroup/>>>>>>>>>> --
>> Mary X. Tang, Ph.D.
>> Stanford Nanofabrication Facility
>> CIS Room 136, Mail Code 4070
>> Stanford, CA 94305
>> (650)723-9980
>>mtang at stanford.edu>>http://snf.stanford.edu>>>>>
--
Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA 94305
(650)723-9980
mtang at stanford.eduhttp://snf.stanford.edu